I'm not sure that such a list would be meaningful at all. Some MSCs are very particular about who they contract with, not allowing the shopper to self assign (or even see) shops the MSC does not feel the shopper could comfortably handle in an acceptable way. These MSCs have an average approval rate of between 95 and 100%. On the other hand there are MSCs that are easy for anyone breathing with enough computer skills to register and self assign to take and perform shops. I would anticipate that their approval rate for shoppers overall may sink as low as 70-75% because many folks can't/won't/don't follow directions.